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QFH radiation problem

 
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baby_1
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Joined: 23 Feb 2016
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PostPosted: Tue Feb 23, 2016 8:56 am    Post subject: QFH radiation problem Reply with quote

Hello
Here is my design

and this is it's radiation pattern

but I want to have a backfire antenna.I use this diagram(but my helix wire diameter is 1.7mm instead of 1.5mm)

Practical sample:


I change helix radius from 10mm to 20mm but it doesn't increase the gain.
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